Here is the teaser for the article : Doors play an essential part in the navigation and progress of the player in many game genres, and locks that require keys are the perfect way to control the flow of play. In this tutorial, we'll examine the basic logic behind doors, locks, and keys.

All of the examples that illustrate the article are made in Construct2 and the capx files are commented and can be downloaded from the article.(The "Download attachment" button on the right side of the article)

Notice it is aimed at intermediate users, but hopefully, beginners can find it useful to a certain extent. Nevertheless it's not a "follow the recipe" kind of article.

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I went through the tut earlier today. Very indepth, and very informative. Would have left a comment on gamedev.tutsplus.com but they have disabled comments for some time now.A 10 out of 10 tutorial as usual :)

Thanks @DUTOIT.For the comments, I know they are moderated, and you need to register/login on Disqus to post them, but I'm still getting comments on older tutorials posted there on a regular basis (I've received and exchanged a few last week). As far as I can tell, comments are not disabled, you might want to check it out, and let me know if you still have issues so I can report the issue to the editors.